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Items 1→50 of 635. Page 1 of 13.
- A.I.D. look up translate image
- Automatic Incident Detection.
- A.M. PEAK HOUR look up translate image
- The one hour in the morning when traffic volumes are highest.
- A.M. PEAK PERIOD look up translate image
- The period (rush hour) in the morning when traffic volumes are highest
- AADT look up translate image
- Average Annual Daily Traffic.
- AASHTO look up translate image
- American Association of State Highway and Transportation Officials.
- ABRASION (PAVEMENT MARKINGS) look up translate image
- A condition manifested in pavement markings by gradual surface erosion, thinning, and disappearance of the film due to wind, water, sand, and vehicle tire wear.
- ACCELERATION look up translate image
- A rate of change of speed (km/h/sec or m/seC2) resulting in an increase in travel speed.
- ACCELERATION LANE look up translate image
- A speed change lane for the purpose of: (1) enabling a vehicle entering a roadway to increase its speed to a rate at which it can more safely merge with through traffic: (2) providing the necessary merging distance: and (3) giving the main road traffic the necessary time to make appropriate adjustments.
- ACCESS look up translate image
- A way of entering or travelling towards a location. It is used when describing which vehicle movements may be permitted at an intersection (such as with an access-only barrier). It is also used when describing the location of driveways and walkways which provide an entrance to a property. See Egress and Ingress.
- ACCIDENT look up translate image
- See Collision.
- ACTUATED OPERATION look up translate image
- Type of traffic signal control operation in which some or all signal phases are actuated from vehicle detectors.
- ACTUATION look up translate image
- The operation of a detector in registering the presence or passage of a vehicle or pedestrian.
- ADVANCE WARNING AREA look up translate image
- The first component of a work zone, upstream of the approach area, used to alert drivers to road work ahead.
- ADVANCED PUBLIC TRANSPORTATION SYSTEMS (APTS) look up translate image
- The application of advanced electronic and communications technologies to improve the safety and efficiency of public transit systems. See also Intelligent Transportation Systems (ITS).
- ADVANCED TRAFFIC MANAGEMENT SYSTEMS (ATMS) look up translate image
- Systems using high-technology devices, on both freeways and urban streets, to more efficiently manage traffic. These include roadside sensors, ramp metering, cameras, dynamic message signs, HOV lanes and synchronized traffic signals that respond to traffic flows.
- ADVANCED TRAVELLER INFORMATION SYSTEMS (ATIS) look up translate image
- This system provides travellers with information to help in trip planning and changing course en route to bypass congestion, e.,g., broadcast traffic reports, in - car computerized maps and highway DMSS. Also can include automated transit trip planning and automated rideshare matching.
- ADVISORY MAXIMUM SPEED look up translate image
- An advisory speed posted when the roadway geometries result in a maximum safe speed which is 20 km/h or more below the operating speed, and is 10 km/h or more below the regulatory speed limit.
- ADVISORY SPEED look up translate image
- The speed, determined to the nearest 5 km/h, at which traffic may safely negotiate a potential hazard under favourable driving conditions.
- AIR BRAKE look up translate image
- A brake in which the mechanism is actuated by the manipulation of air pressure. The term is often used to describe brakes that employ air under pressure above atmospheric, in contrast to vacuum brakes, which employ pressure below atmospheric.
- ALL-RED INTERVAL (TRAFFIC SIGNAL) look up translate image
- The time in seconds of a red indication for all intersection traffic. It is used following an Amber Clearance Interval to permit vehicles or pedestrians to clear the intersection before conflicting traffic receives a green indication. In Temporary Conditions, the All-red Interval is used to clear a one-lane section through a work site before opposing traffic receives a green indication.
- AMBER CLEARANCE INTERVAL (TRAFFIC SIGNAL) look up translate image
- The clearance interval in which the signal indication for that Phase is amber. A clearance interval to warn approaching traffic to clear the intersection before conflicting traffic receives a green indication.
- ANNUAL AVERAGE DAILY TRAFFIC (AADT) look up translate image
- The total yearly traffic volume on a given road divided by the number of days in the year.
- ANNUAL AVERAGE WEEKDAY DAILY TRAFFIC (AAWDT) look up translate image
- The total yearly traffic volume on a given road collected on weekdays and divided by the number of weekdays (252 or 253 days) in the year. Traffic volumes on statutory holidays are not included.
- APPROACH AREA look up translate image
- The second component of a work zone, downstream of the advance warning area, and upstream of the transition area, in which the driver is informed of lane changes, speed reductions, passing restrictions and the like.
- APPROACH NOSE look up translate image
- The end of a traffic island first encountered by a road user approaching from a given direction- also called the Upstream End. Depending on the situation, traffic may pass only to the right of the island, or on both sides. Each traffic island has two approach ends, one for each direction of travel.
- APPROACH SPEED look up translate image
- The maximum safe speed that can be maintained over a short section of highway immediately in advance of a potentially hazardous location, taking into account pavement and shoulder width, horizontal and vertical alignment, sight distance, and other controlling factors. The approach speed does not necessarily coincide with the Design Speed.
- APTS look up translate image
- Advanced Public Transit Systems. See Intelligent Transportation Systems (ITS).
- AREA PARKING CONTROL look up translate image
- A parking control plan for an area or community.
- ARTERIAL ROAD look up translate image
- A Major Road, used primarily for through traffic rather than for access to adjacent land, that is characterized by high vehicular capacity and continuity of movement. Intersections are spaced relatively far apart and are frequently signalized. See also Collector Road and Local Road.
- ASSURANCE SIGN look up translate image
- A Directional Guide Sign or Trailblazer, providing confirmation to the travellers that they are on the desired route or road, and/or are traveling toward the desired destination.
- ASTM look up translate image
- American Society for Testing and Materials.
- AT-GRADE INTERSECTION look up translate image
- An intersection of two roadways where there is no vertical separation between the two roadways at their point of intersection.
- ATC look up translate image
- Area Traffic Control.
- ATIS look up translate image
- Advanced Traveller information Systems.
- ATMS look up translate image
- Advanced Traffic Management Systems.
- ATSSA look up translate image
- American Traffic Safety Services Association.
- AUTOMATIC VEHICLE IDENTIFICATION (AVI) look up translate image
- Vehicles equipped with AVI transponders are identified when they come within range of a roadside communication unit. Most common application is for automatically collected tolls on toll highway: however, the system may also be used as a means of automatically collecting travel time information along freeways.
- AUTOMATIC VEHICLE IDENTIFICATION IN ONTARIO (AVION) look up translate image
- A commercial vehicle electronic clearance system along Highway 401 (Windsor to Whitby) and Interstate 1-75 in the U.S.
- AUTOMATIC VEHICLE LOCATION (AVL) look up translate image
- A system which enables the approximate location of a vehicle to be determined and tracked as it traverses the transportation network. Commonly used by emergency services and transit agencies to track location of vehicles. Also can be used to monitor traffic conditions by obtaining probe reports from vehicles travelling in the network.
- AVC look up translate image
- Automated Vehicle Classification.
- AVERAGE DAILY TRAFFIC (ADT) look up translate image
- The total volume during a given time period in whole days greater than one day and less than one year divided by the number of days in that time period.
- AVG look up translate image
- Automated Vehicle Guidance.
- AVI look up translate image
- Automatic Vehicle Identification.
- AVION look up translate image
- Automatic Vehicle Identification in Ontario.
- AVL look up translate image
- Automatic Vehicle Location.
- BAILEY BRIDGE look up translate image
- See Temporary Bridge.
- BALL BANK INDICATOR look up translate image
- A mechanical or electronic device that can be mounted inside a four-wheel vehicle. Readings of the ball bank indicator show the combined effects of the body rolling angle, centrifugal force and superelevation angle to estimate the safe operating speed around a curve.
- BARRICADE look up translate image
- A device which provides a visual indicator of a hazardous location or the desired path a motorist should take, but is not intended to contain or redirect a vehicle. A barricade is intended to provide separation or to inform of closure, or to provide direction to pedestrians. A barricade is not a primary means of providing direction to motorists, but is supplemental to other traffic control devices providing delineation.
- BARRIER look up translate image
- A device which provides a physical limitation, through which a vehicle would not normally pass, and is intended to contain or redirect an errant vehicle of a particular size range, at a given speed and angle of impact.
- BASE PERIOD look up translate image
- See Off-peak Period.
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